矿化垃圾生物覆盖层减少垃圾填埋场CH_4、N_2O和CO_2释放的效应研究  

Effect of Aged Refuse Bio-Cover Mitigating Emission of Greenhouse Gases (CH_4,N_2O and CO_2) From MSW Landfills

作　　者：刘景龙[1,2] 张毅[2] 张后虎[2] 赵克强[2] 黄天寅[1] 严小飞[2] 

机构地区：[1]苏州科技学院环境科学与工程学院,江苏苏州215009 [2]环境保护部南京环境科学研究所,江苏南京210042

出　　处：《生态与农村环境学报》2014年第1期15-20,共6页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(41005090;41375161);环保公益性行业科研专项(201109024)

摘　　要：对利用矿化垃圾构建生物覆盖层以削减填埋场温室气体的释放问题进行了深入研究,分析了环境因素对CH4释放的作用,考察了作为生物覆盖层材料的矿化垃圾的厚度变化对CH4氧化的影响.结果表明,温度为5～45℃时,矿化垃圾对CH4的氧化速率平均值分别约为黏性土和砂性土的2.35和4.71倍,CH4氧化速率随温度的升高而增加,并在35℃时达到最大值.当含水率w为16％ ～ 24％时,纯矿化垃圾覆盖层、半矿化垃圾覆盖层和砂性土覆盖层CH4氧化能力均达到最大.砂性土覆盖层和半矿化垃圾覆盖层CH4释放通量平均值分别为纯矿化垃圾覆盖层的329.8倍（P＜0.05）和91.7倍（P＜0.05）,添加矿化垃圾填料会增加覆盖层N2O释放通量,纯矿化垃圾覆盖层N2O（以N计）释放通量平均值分别为半矿化垃圾覆盖层和砂性土覆盖层的2.1倍（P＜0.05）和3.5倍（P＜0.05）.The use of bio-cover composed of aged refuse to reduce emission of greenhouse gases （CH4, N20 and CO2） from landfills was studied in depth, analyzing roles of environmental factors in CH4 emission and CH4 oxidation relative to thickness of the aged refuse cover. Results show that when temperature varied in the range of 5-45 ℃, the mean CH4 oxi- dation rate of aged refuse was 2. 35 times that of clayey soil and 4. 71 times that of sandy soil, and it increased with rising temperature and peaked at 35 ＂C. When moisture content in the cover layer was maintained in the range of 16%-24%, all the three covers peaked in CH4 oxidizing capacity. The mean CH4 flux from the sandy soil cover and the semi-mineralized refuse cover was 329. 8 and 91, 7 times of that from the pure aged refuse cover, respectively. Addition of aged refuse in the cover would increase the flux of N20 oxidation. The mean flux of N20 emission from the pure aged refuse bio-cover was 2. 1 times （P〈0. 05） and 3.5 times （P〈0. 05） of that from the semi-aged refuse cover and sandy soil cover, respectively.

关 键 词：矿化垃圾 生物覆盖层 CH4氧化能力 温室气体 效应 

分 类 号：X705[环境科学与工程—环境工程]